Wound non-aqueous electrolyte battery

Abstract

A wound non-aqueous electrolyte battery includes a positive electrode, a negative electrode, a separator provided between the positive and negative electrodes, and a non-aqueous electrolyte. The negative electrode includes a lithium-aluminum alloy sheet. The lithium-aluminum alloy sheet has surfaces including a surface of which parts are flush and connected with one another via grain boundaries of lithium-aluminum alloy. An average grain boundary number N is 8.75 or less, the average grain boundary number N being provided as ΣG i /ΣL i by dividing ΣG i by ΣL i , where ΣG i is a sum of numbers of grain boundaries G i out of the plurality of grain boundaries which intersect M line segments PQ i respectively connecting point P i to point Q i on the surface of the lithium-aluminum alloy sheet, ΣL i is a sum of lengths Li of the M line segments PQ i , M is an integer greater than 1, and i is an integer satisfying 1<i≤M).

1 . A wound non-aqueous electrolyte battery comprising:
 a positive electrode;   a negative electrode;   a separator provided between the positive electrode and the negative electrode; and   a non-aqueous electrolyte, wherein   the negative electrode includes a lithium-aluminum alloy sheet,   the lithium-aluminum alloy sheet has surfaces including a surface of which parts are flush and connected with one another via a plurality of grain boundaries of lithium-aluminum alloy, and   an average grain boundary number N is 8.75 or less, the average grain boundary number N being provided as ΣG i /ΣL i  by dividing ΣG i  by ΣL i , where ΣG i  is a sum of numbers of grain boundaries G i  out of the plurality of grain boundaries which intersect M line segments PQ i  respectively connecting point P i  to point Q i  on the surface of the lithium-aluminum alloy sheet, ΣL i  is a sum of lengths Li of the M line segments PQ i , M is an integer greater than 1, and i is an integer satisfying 1<i≤M).   
     
     
         2 . The wound non-aqueous electrolyte battery according to  claim 1 , wherein (G α +G β )/2≤14 is satisfied, where G α  is a number of grain boundaries out of the plurality of grain boundaries intersecting one diagonal line α of a rectangular region of 1.28 mm×0.96 mm on the surface of the lithium-aluminum alloy sheet, and G β  is a number of grain boundaries out of the plurality of grain boundaries intersecting another diagonal line β of the rectangular region. 
     
     
         3 . The wound non-aqueous electrolyte battery according to  claim 2 , wherein the number of grain boundaries G α  intersecting the one diagonal line α and the number of grain boundaries G β  intersecting the another diagonal line β satisfy 5≤(G α +G 62  )/2≤14. 
     
     
         4 . The wound non-aqueous electrolyte battery according to  claim 2 , wherein a grain boundary aspect ratio A provided as A=G α −G β )/(G α +G β ) is 0.2 or less. 
     
     
         5 . The wound non-aqueous electrolyte battery according to  claim 1 , wherein an aluminum content in the lithium-aluminum alloy sheet is equal to or more than 0.3 mass % an equal to or less than 1.0 mass %. 
     
     
         6 . The wound non-aqueous electrolyte battery according to  claim 1 , wherein the positive electrode contains manganese dioxide.